3.1.5 Getting Started Application Using Harmony v3 Drivers on PIC32CZ CA90 Curiosity Ultra Development Board Using FreeRTOS

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Description

The application reads the current room temperature from the temperature sensor on the I/O1 Xplained Pro Extension kit. The temperature reading is displayed on a serial console periodically every second. In addition, the application writes the temperature readings to EEPROM. When a character is entered on the console, the last five written temperature values are read from the EEPROM and displayed on the console. An LED (LED0) on the PIC32CZ CA90 Curiosity Ultra development board is toggled every time the temperature is displayed on the serial console.

Modules/Technology Used

  • Peripheral Modules
    • PORT
    • Clock
    • EVSYS
    • SERCOM0
    • SERCOM1
    • TCC0
    • DMA
    • NVIC
  • Drivers
    • USART
    • I2C
  • System Services
    • Time
  • Third Party Libraries
    • FreeRTOS
The following figure provides the MCC Harmony project graph with all the components.

Hardware Used

Software/Tools Used

Refer to the Project Manifest present in harmony-manifest-success.yml under the project folder pic32cz_ca90_cult_getting_started_freertos/firmware/src/config/pic32cz_ca90_cult.

  • Refer to the Release Notes to know the MPLAB X IDE and MCC Plug-in version

Due to Microchip regularly updates tools, occasionally issue(s) could be discovered while using the newer versions of the tools. If the project does not seem to work and version incompatibility is suspected. It is recommended to double-check and use the same versions that the project was tested with. To download original version of MPLAB Harmony v3 packages, refer to the document How to Use the MPLAB Harmony v3 Project Manifest Feature (DS90003305).

Setup

  • Verify that the I/O1 Xplained Pro Extension kit (temperature sensor) is connected to Extension Header 1 (EXT1) on the PIC32CZ CA90 Curiosity Ultra development board
  • Connect the Type-A male to Micro-B USB cable to Micro-B DEBUG USB port (J200) to program and debug the PIC32CZ CA90 Curiosity Ultra development board and connect to a external power supply (6.5V to 14V) to power-up the board

Programming Hex File

The pre-built hex file can be programmed by following the below steps.

Steps to program the hex file

  • Open MPLAB X IDE
  • Close all existing projects in IDE, if any project is opened
  • Go to File>Import>Hex/ELF file
  • In the Import Image File window,
    1. Create Prebuilt Project,
      • Click the Browse button to select the prebuilt hex file
      • Select Device as PIC32CZ8110CA90208
      • Ensure the proper tool is selected under Hardware Tool and click the Next button
    2. Select Project Name and Folder,
      • Select appropriate project name and folder and click the Finish button
  • In MPLAB X IDE, click the Make and Program Device button to program the device
  • Follow the steps in Running the Demo section below

Programming/Debugging Application Project

  • Open the project (pic32cz_ca90_cult_getting_started_freertos/firmware/pic32cz_ca90_cult.X) in MPLAB X IDE
  • Ensure PIC32CZ CA90 Curiosity Ultra is selected as hardware tool to program/debug the application
  • Build the code and program the device by clicking on the Make and Program button in MPLAB X IDE tool bar
  • Follow the steps in Running the Demo section below

Running the Demo

  • Open the Tera Term terminal application on the PC (from the Windows Start menu by pressing the Start button)
  • Change the baud rate to 115200
  • The user should see the temperature values (in °F) being displayed on the terminal every 500 milliseconds, as shown below
  • Notice the LED0 blinking at 1 second rate
  • Press any character on the terminal to display the last five values written to the EEPROM
  • The user may vary the temperature by placing the finger on the temperature sensor (for a few seconds)

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